G. Geri et al., MORPHOLOGICAL-CHARACTERISTICS AND CHEMICAL-COMPOSITION OF MUSCLE IN THE MIRROR CARP (CYPRINUS-CARPIO VAR SPECULARIS) AS INFLUENCED BY BODY-WEIGHT, Aquaculture, 129(1-4), 1995, pp. 323-327
The evolution of morphological traits and muscle chemical composition
during growth was analysed by allometric or normal regression (on body
weight or total length or total lipid) utilizing a preliminary series
of data obtained from mirror carps ranging from 39 to 2776 g body wei
ght. The fish came from earthen ponds fed with warm water (refluent fr
om a thermal power station) at about 10 degrees C above natural temper
ature, As regards allometric coefficients of components on body weight
, gills (0.70) and filleting remnants (0.85) were the earliest growing
while viscera (1.18) and skin (1.11) were the latest. Isoauxesis resu
lted for fins, excluding pelvic fins that were later growing (1.08). A
s regards relative growth of lengths and thicknesses on total body len
gth, head length (0.82) was the earliest and abdomen (1.15) and trunk
lengths (1.12) were the latest growing; all body thicknesses showed ta
chyauxesis, particularly on the hind-portions. As regards the chemical
composition of muscle, cholesterol (mg/100 g) and the C20:4 and C22:6
percentages showed a linear decreasing trend with increasing body wei
ght, while the opposite resulted for C18:1, SFA and MUFA content. Lipi
d, C16, C16:1, C20:5 and n-3 PUFA content presented a decreasing trend
followed by an increase, while C18:2 and n-6 PUFA content showed the
opposite behaviour. Intramuscular lipid content influenced the chemica
l composition of muscle: as lipid content increased, C18:1 also increa
sed, while C18:2 and n-3 PUFA decreased; C14, C16:1 and MUFA showed an
increasing trend followed by a decreasing phase, while C16, C18, C20:
4, C22:6, SFA and n-6 PUFA showed the opposite.